ic0c01832_si_001.pdf (1.47 MB)
Hollow V‑Doped CoMx (M = P, S, O) Nanoboxes as Efficient OER Electrocatalysts for Overall Water Splitting
journal contribution
posted on 2020-07-31, 16:05 authored by Cheng Wang, Hui Xu, Yuan Wang, Hongyuan Shang, Liujun Jin, Fangfang Ren, Tongxin Song, Jun Guo, Yukou DuHollow nanostructures with intricate
interior and catalytic effects
have been the focus of researchers in energy conversion and storage.
Although tremendous efforts have been made, the fabrication of well-defined
hollow nanostructures has been rarely reported due to the limitations
of the synthetic methods. Herein, we have proposed a general synthetic
strategy for the construction of V-doped CoMx (M = P, S, O) nanoboxes (NBs), where the doped V effectively
modifies the electronic structure of CoMx to provide a favorable surface electrochemical environment for the
adsorption of reaction intermediates (*O, *OH, and *OOH), leading
to a significant enhancement in electrocatalytic performance. More
importantly, the hollow nanostructures can expose abundant surface
active areas and promote the chemical adsorption of reactants and
intermediates, greatly contributing to the promotion of electrocatalytic
performance. Impressively, the optimal V-doped CoS2 NBs
show excellent electrocatalytic oxygen evolution reaction (OER) performance
with an overpotential of only 290 mV at 10 mA cm–2, along with outstanding overall water-splitting performance. This
work supplies pivotal insights for constructing high-performance OER
catalysts on the basis of electronic and geometric engineering.